The Ultimate List of Brain Weights for Animals

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The brain size can differ greatly between animals including among species of the same animal.

We wanted here to list the brain weights of many common/familiar animals on the planet. Other such lists on the internet are not that big and probably missing many important animals.

This reference article will be helpful for someone writing a relevant article, comparing the brain weights of animals, comparing the intelligence of animals or just learning about brain sizes in general.

Here is the data in both metric and imperial units:

AnimalBrain Weight (g)Brain Weight (oz)Brain-Body Mass Ratio
Aardvark802.81:562
African bush elephant54361921:791
African wild dog1294.61:171
Aligator140.501:14560
American black bear2488.71:105
Armadillo8.50.301:323
Asian black bear2699.51:260
Asian elephant52111841:531
Baboon1525.41:87
Bald eagle190.661:249
Barn owl6.70.241:48
Bat0.160.0061:50
Beaked whale2004711:1134
Beaver521.81:530
Beluga whale1921681:259
Bison458161:942
Blue whale36361281:14000
Bobcat652.31:98
Bottlenose dolphin1573551:108
Bowhead whale2738971:33236
Brown bear336121:390
Buffalo648231:1028
Camel762271:525
Canary0.570.021:43
Capybara752.61:380
Caracal521.81:148
Cardinal1.60.061:28
Cassowary381.31:1188
Cat260.901:129
Catfish0.160.0061:333
Cattle453161:102
Cheetah1113.91:387
Chimpanzee355131:170
Chipmunk2.20.081:43
Civet260.921:107
Cockatiel2.50.091:36
Cockatoo150.521:61
Common dolphin797281:82
Cougar1545.41:353
Coyote853.01:116
Crocodile160.551:8590
Crow7.40.261:60
Deer pig1274.51:614
Donkey434151:539
Duck5.60.201:206
Dugong2659.31:1062
Eastern grey kangaroo702.51:378
Elephant seal1205431:1665
Emu301.11:1041
Eurasian elk436151:459
Fallow deer2257.91:166
Fin whale51001801:12255
Flamingo110.381:280
Fox501.81:75
Frog0.110.0041:541
Genet140.491:130
Giant anteater843.01:225
Giant panda2057.21:427
Giraffe700251:1727
Goat1154.11:241
Golden eagle180.631:248
Goldfish0.100.0031:98
Gorilla455161:266
Gray whale43171521:6950
Groundhog140.501:198
Guinea pig4.80.171:99
Hamster2.20.081:135
Hare140.511:136
Hedgehog3.70.131:196
Hippo720251:1876
Honey badger732.61:111
Horse693241:492
House mouse0.400.0141:38
Human1250441:52
Hummingbird0.160.0051:20
Humpback whale61002151:4926
Hyena1756.21:356
Hyrax190.691:119
Impala1756.21:329
Jackal722.51:99
Jaguar1495.31:521
Jerboa1.50.051:42
Junglefowl3.30.121:278
Koala200.711:287
Leopard1354.81:356
Lion2609.21:324
Lizard0.030.0011:114
Llama2649.31:341
Lynx692.41:251
Manatee364131:2077
Mandrill1595.61:72
Maned wolf1204.21:193
Manta ray1224.31:1352
Marmoset7.70.271:45
Marten210.741:69
Meerkat100.361:70
Minke whale28501011:1960
Mole1.40.051:56
Mongoose8.80.311:61
Moose407141:668
Mountain sheep1404.91:393
Muskrat5.00.181:226
Narwhal29941061:527
Orca60522131:541
Oryx282101:621
Ostrich421.51:2779
Otter391.41:173
Pangolin9.40.331:190
Parakeet1.60.051:18
Peafowl7.10.251:589
Pelican250.891:269
Penguin200.721:240
Peregrine falcon6.40.231:160
Pigeon2.30.081:118
Pilot whale2466871:157
Platypus100.361:138
Polar bear507181:625
Polecat7.90.281:116
Porcupine250.871:219
Porpoise1735611:82
Prairie dog5.70.201:152
Rabbit7.60.271:137
Raccoon411.41:121
Red deer409141:489
Red kangaroo622.21:741
Reindeer278101:258
Rhesus macaque883.11:52
Rhino643231:2177
Roe deer933.31:188
Salmon1.40.051:3902
Sea bass1.10.041:3131
Sea lion405141:225
Sea turtle2.70.101:2016
Seahorse0.020.0011:866
Seal315111:234
Sei whale49001731:7483
Sheep1756.21:317
Skunk100.361:195
Sloth160.571:204
Sloth bear2679.41:510
Snake0.080.0031:675
Sperm whale81832891:4572
Squirrel7.40.261:68
Stork150.541:220
Street rat8.00.281:45
Sun bear386141:117
Swan230.791:480
Tapir853.01:168
Tiger270101:723
Toad0.070.0031:610
Treeshrew3.20.111:53
Trout0.820.031:3362
Tuna4.00.141:1864
Turkey vulture100.361:138
Vervet monkey632.21:69
Vicuna2007.11:231
Walrus1410501:725
Warthog1334.71:506
Weasel2.00.071:30
White shark301.01:24628
White-tailed deer2107.41:310
Wild boar1706.01:511
Wildebeest443161:479
Wolf1304.61:239
Wolverine732.61:146
Zebra562201:471

Please note the following about the data in the table:

  • For each animal species, we tried to use the data of male when possible
  • If there are more than one species of the animal, we simply used the most popular one
  • We included the brain-body mass ratio because it could be an indicator of the animal’s intelligence

The brain sizes (in grams) were sourced from datasets of some academic journals, which are referenced below. And the brain-body mass ratio was calculated based on the body weight available in the data.

To conclude, we have listed the brain weights and ratios of many common animals. The list includes mammals, birds, reptiles, amphibians and Invertebrates. And the measurements are both in metric (g, kg) and imperial units (oz, lb).

From the elephant to crocodile to dolphin to frog, you can find and compare the brain size of over 160 different animals across several animal classes.

This is one of the shortest articles we have published so far since it merely lists some animal’s brain sizes. But of course, compiling all these numbers took quite some time to do.

Hope the information was helpful for you.

Please let us know if you want the brain data of any more animals to be included in the list.

Reference

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